Flop: ($0,57) Q
, 6
, 4(3 players)BB bets $0,57, CO raises to $1,74, Hero calls $1,74, BB folds.
get it in here? i thought BB would come over the top but wasn't the case unfortunately
[edit: or even worse, is it the case that when BB comes over the top i'm beat by higher set? i only have bottom set after all]

Well, I doubt actually that I would play much differently.
The case on flop is that the raise is already a very strong line and if we 3bet then we practically just making Qx hands to fold. But while they may still pay us. Nice hand!